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<?php $text = "3r. & ms.: A programming language"; $result = preg_replace_callback('/^([^a-z]*)([a-z])/i', function($m) { return $m[1].strtoupper($m[2]); }, $text); echo $result;
Output for git.master, git.master_jit, rfc.property-hooks
3R. & ms.: A programming language

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